tests complete for ClayConfig and ClayItem

test/test-utils.js

@@ -0,0 +1,16 @@
+'use strict';
+
+var assert = require('chai').assert;
+
+/**
+ * @param {Object} object
+ * @param {Array} properties
+ */
+module.exports.checkReadOnly = function(object, properties) {
+  properties.forEach(function(property) {
+    assert.strictEqual(
+      Object.getOwnPropertyDescriptor(object, property).writable,
+      false
+    );
+  });
+};